Castillo de San Marcos Tours
A fortress of coquina stone: tours explore the Castillo de San Marcos, the oldest masonry fort in the continental USA, guarding the bay since the 17th century, with cannon, ramparts and sweeping harbour views. Living history.
30 tour · prices per person, book with partner
Castillo de San Marcos in St Augustine — FAQ
What is the Castillo de San Marcos?
The oldest masonry fort in the continental United States.
What is coquina?
A soft shell-stone that made the fort remarkably strong.
Can you visit inside the fort?
Yes — the ramparts, cannon and rooms are open to visitors.























